[6-(tert-butyl-dimethyl-silanyloxy)-3-chloro-indol-1-yl]-acetic acid tert-butyl ester 、
tetra-n-butylammoniumfluoride trihydrate 以to obtain (3-chloro-6-hydroxy-indol-1-yl)-acetic acid tert-butyl ester as colorless gum的产率得到(3-chloro-6-hydroxy-indol-1-yl)-acetic acid tert-butyl ester